Omphaloskepsis?! LOL. I found that some of their choices didn't quite correspond to my understanding of the word in question. And then it started kinda blurring on me after a while so I quit while I was ahead, aka at level 43.
These are the ones that I got wrong and either should have known or found interesting.
donnish = academic
froward = headstrong
sophism = fallacy
natatorium = swimming pool
sinistral = left-handed
quietus = death
inveigh = protest
pretermit = disregard
ferine = savage
tellurian = earth-related
Also, interesting: alameda = tree-covered walkway. Nice name for a city. :-)